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<p>[QUOTE=&quot;Conder101, post: 1165826, member: 66&quot;]Mintmarks were added at Philadelphia.&nbsp; I don&#039;t believe the branch mints did their own hardening of the dies and they would not have been able to punch mintmarks into a hardened die. The acid etching was the result of the cleaning needed after the hardening process to remove the oxidation and scale left from the heating.&nbsp; The initial polishing was the result of basining or lapping the dies to provide the proper metal flow on the presses the individual mints were using.&nbsp; The mints did not all use the same presses and from my understanding different presses needed the dies basined to different curvatures to get the right metal flow.&nbsp; Since each mint would be more familiar with their own presses it would make more sense for them to do their own basining.&nbsp; The extent of the PL effect would be a function of the amount of polishing and the fineness of the grit used.[/QUOTE]</p><p><br /></p>

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